[docs] another example for hcat (JuliaLang#34501)

To help avoid confusion from actual use case
halleysfifthinc · Jan 28, 2020 · a196a0b · a196a0b
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commit a196a0b
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diff --git a/base/abstractarray.jl b/base/abstractarray.jl
@@ -1539,6 +1539,15 @@ julia> hcat(c...)
  1 4
  2 5
  3 6
+
+julia> x = Matrix(undef, 3, 0) # x = [] would have created an Array{Any, 1}, but need an Array{Any, 2}
+3×0 Array{Any,2}
+
+julia> hcat(x, [1; 2; 3])
+3×1 Array{Any,2}:
+ 1
+ 2
+ 3
 ```
 """
 hcat(X...) = cat(X...; dims=Val(2))